Im back with a new computer. A earlier post in this thread stated that crushed walnut shell works good as a absorbing agent. I bought 25 pouns to test. Five pounds was 5.47. 25 Pounds was 18.99. Got it at petsmart. So far in my testing the vermiculite worked the best. Lasted about 1 month. The only problem is this material is very light. i will keeep you all posted.